CN212127756U

CN212127756U - Composite filter element device

Info

Publication number: CN212127756U
Application number: CN202020656049.3U
Authority: CN
Inventors: 朱锦成; 曹浩; 陈冲; 欧阳博; 高道龙
Original assignee: Zhejiang Lonsid Healthy Drinking Water Equipment Co ltd
Current assignee: Zhejiang Lonsid Healthy Drinking Water Equipment Co ltd
Priority date: 2020-04-26
Filing date: 2020-04-26
Publication date: 2020-12-11
Anticipated expiration: 2030-04-26

Abstract

The utility model discloses a composite filter element device, include: the device comprises a front filter element device, a rear filter element device, an RO (reverse osmosis) membrane filter element device, a first filter flask for mounting the front filter element device and the rear filter element device, a second filter flask for mounting the RO membrane filter element device and a control device, wherein the front filter element device is arranged at the upper part of the first filter flask, the bottom of the front filter element device is provided with a central tube, the lower part of the central tube is provided with a front water outlet, and the rear filter element device is sleeved at the peripheral part of the central tube and is not communicated with the front filter element device; a first cavity communicated with the front filter element device and a second cavity communicated with the rear filter element device are arranged in the first filter bottle, and a first water inlet and a first water outlet communicated with the first cavity and a second water inlet and a second water outlet communicated with the second cavity are arranged at the bottom of the first filter bottle; the first water inlet, the first water outlet, the second water inlet and the second water outlet are all connected with the control device. The device can ensure the service life and the filtering effect of the filter element and effectively reduce the floor space of the machine.

Description

Composite filter element device

Technical Field

The utility model relates to a filter technical field, more specifically say, relate to a composite filter element device.

Background

In the prior art, the water treatment process of the water purifier is that raw water is pretreated by a preposed filter element, is finely filtered by an RO (reverse osmosis) membrane and is finally improved in taste by active carbon. Wherein, the postposition active carbon is used as an important component part formed by the filter element of the reverse osmosis pure water machine, and is generally connected at the tail end of a water path of the reverse osmosis pure water machine, namely: water firstly passes through a pre-pretreatment filter element (the pre-pretreatment filter element comprises 2 or three of rough filtration PP cotton, active carbon and fine filtration PP cotton), then passes through an RO membrane for fine filtration, and is finally used at a terminal after the taste is improved by a post-filter element. Therefore, many producers can compound leading filter core, and the RO membrane is compound with rearmounted active carbon, perhaps compounds five grades of filter cores, however, the filter flask space that sets up like this can compare original not the space of composite construction and reduce, but the filter flask volume is still great and heavy, and because of filter core life inconsistent at different levels, can lead to needing whole changes when the renew cartridge, and the expense of renew cartridge is very expensive, is unfavorable for improving filter core life like this and reduces cost of maintenance.

At present, a plurality of manufacturers combine a front filter element into a filter element to be arranged in a filter bottle, then independently arrange an RO filter element in a filter bottle, independently arrange a rear filter element in a filter bottle, and arrange all filter elements with different specifications and effects in three filter bottles to realize four/five-stage filtration of three filter elements. However, the volume of three filter bottles is reduced compared with the original four/five filter bottles, but the volume of the three filter bottles is still larger.

In summary, a need exists in the art for a filter device that can not only ensure the service life of the filter element and the filtration level, but also effectively reduce the floor space of the machine.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a composite filter element device, it both can guarantee filter core life-span and filter effect, can effectively reduce machine occupation of land size again, and this device simple structure, convenient to use can use widely.

In order to achieve the above object, the present invention provides the following technical solutions:

a composite filter element arrangement comprising: the filter comprises a front filter element device for coarsely filtering water, a rear filter element device for improving water quality and taste, an RO (reverse osmosis) membrane filter element device for finely filtering the water, a first filter flask for installing the front filter element device and the rear filter element device, a second filter flask for installing the RO membrane filter element device and a control device for controlling water path circulation, wherein the front filter element device is arranged at the upper part of the first filter flask, the bottom of the front filter element device is provided with a central tube communicated with a channel of the front filter element device, the lower part of the central tube is provided with a front water outlet, and the rear filter element device is sleeved at the peripheral part of the central tube and is not communicated with the front filter element device;

a first cavity communicated with the front filter element device and a second cavity communicated with the rear filter element device are arranged in the first filter bottle, and a first water inlet communicated with the first cavity, a first water outlet communicated with the front water outlet, a second water inlet communicated with the second cavity and a second water outlet are arranged at the bottom of the first filter bottle; the second filter flask is provided with an RO membrane water inlet and an RO membrane water outlet; the first water inlet, the first water outlet, the second water inlet, the second water outlet, the RO membrane water inlet and the RO membrane water outlet are all connected with the control device.

Preferably, the front filter element device comprises a front filter element, a front filter element lower end cover, a penetrating and locating part, wherein the top of the first filter bottle abuts against and is used for fixing the top of the front filter element, the front filter element lower end cover is arranged at the top of the front filter element and runs through the front filter element center and is internally provided with the framework of the channel, the front filter element upper end cover is used for fixing the bottom of the front filter element and the front filter element upper end cover is used for communicating with the bottom of the framework, the first water inlet is communicated with the first cavity, the first cavity is communicated with the side part of the front filter element, and the front water outlet is communicated with the first water outlet.

Preferably, the post-filter device comprises: the filter comprises a rear filter element, a rear filter element lower end cover, a rear filter element inner sleeve, a rear filter element upper end cover and a rear filter element outer sleeve, wherein the rear filter element is sleeved on the periphery of the central tube;

the second cavity is arranged between the rear filter element inner sleeve and the rear filter element outer sleeve, the second water inlet is communicated with the rear filter element inner sleeve, and the second water outlet is communicated with the rear filter element outer sleeve.

Preferably, the preposed filter element upper end cover is connected with the postposition filter element outer sleeve in a rotary fusion welding mode, so that the preposed filter element device is separated from a water channel of the postposition filter element device.

Preferably, the preposed filter element comprises folded PP and sintered activated carbon, and non-woven fabrics for avoiding black water or carbon slag generated in the using process from falling are wound on the periphery of the framework.

Preferably, the post-filter element comprises compressed activated carbon and a nano fiber FACT filter element for sterilization.

Preferably, a filter bottle cap is arranged at the bottom of the first filter bottle, the first water inlet, the first water outlet, the second water inlet and the second water outlet are arranged on the filter bottle cap, a check valve is correspondingly arranged on each water outlet, and the control device is connected with the check valve to control the check valve to be opened and closed.

Preferably, the connection of the internal parts of the front filter element device and the rear filter element device and the connection between the two are sealing ring sealing connection.

When the composite filter element device provided by the utility model is used, firstly, the control device can control only the first water inlet to be opened, so that water enters the first cavity from the first water inlet, and then the water is subjected to rough filtration of pretreatment through the preposed filter element device; then, the first water inlet is controlled to be closed, the first water outlet is controlled to be opened, and the RO membrane water inlet is controlled to be opened, so that the water after coarse filtration enters the RO membrane filter element device in the second filter flask for fine filtration; then, the first water outlet and the RO membrane water inlet are controlled to be closed, and the RO membrane water outlet and the second water inlet are controlled to be opened, so that the finely filtered water is conveyed into the second chamber, and then the finely filtered water is treated by the post-filter element device, so that the taste of the water quality is improved; and finally, controlling the RO membrane water outlet and the second water inlet to be closed, and opening the second water outlet so as to output the filtered water which meets the requirements.

And, because the filter core of this apparatus has adopted the upside-down mounting way, make water need enter the first cavity from bottom to top, and then carry on the coarse filtration through the leading filter core apparatus, and in the course that the water enters the first cavity, will discharge along with the gas of the same volume synchronously, because the gas density is smaller than the water density, so the gas can stop in the upper half of the first filter flask, and the leading delivery port locates in the lower half of the first filter flask, after the water pressure of the influent water in the first cavity reaches the equilibrium with pressure of the compressed gas, the height that the water enters the first cavity can't increase again, the water flows into the leading filter core apparatus from the outside of the leading filter core apparatus again, and flow into inner channel and centre tube, only when the water level reaches the height of the leading delivery port, the coarse filtration water can flow out from the leading delivery port, thus has greatly increased the height of the influent water stream, thereby improving the effective filtering area of the preposed filter element device.

In addition, this device designs many filter cores into two filter cores because the function and the uniqueness of RO filter core (it needs three routes water course), and the value of RO filter core is higher. In the in-service use process, need earlier through leading filter core device preliminary treatment water quality, can effectively prolong the life of RO membrane like this, at the in-process of renew cartridge, it is leading filter core of renewal earlier generally, renew the RO filter core again, and the RO filter core life-span is 2 times of leading filter core generally, therefore, keep independent design with the RO filter core, make up leading filter core and rearmounted filter core, set up the life that both can effectively guarantee each part and reduce cost of maintenance like this, also can reduce device spatial structure by a great extent.

To sum up, the utility model provides a composite filter element device both can guarantee filter core life-span and filter effect, can effectively reduce machine occupation of land size again, and this device simple structure, convenient to use can use widely.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is an exploded schematic view of the composite filter element device provided by the present invention;

FIG. 2 is a cross-sectional view of the composite filter element assembly in use;

FIG. 3 is a schematic structural view of a center tube;

fig. 4 is a schematic structural view of the skeleton.

In fig. 1-4:

the filter comprises a first filter flask 1, a preposed filter element lower end cover 2, a preposed filter element 3, a framework 4, a central tube 5, a preposed filter element upper end cover 6, a postposed filter element lower end cover 7, a postposed filter element 8, a postposed filter element inner sleeve 9, a postposed filter element upper end cover 10, a postposed filter element outer sleeve 11, a filter bottle cover 12, a one-way valve 13 and a preposed water outlet 14.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The core of the utility model is to provide a composite filter element device, it both can guarantee filter core life-span and filter effect, can effectively reduce machine occupation of land size again, and this device simple structure, convenient to use can use widely.

Referring to fig. 1 to 4, fig. 1 is an exploded schematic view of a composite filter element device according to the present invention; FIG. 2 is a cross-sectional view of the composite filter element assembly in use; FIG. 3 is a schematic structural view of a center tube; fig. 4 is a schematic structural view of the skeleton.

This embodiment provides a composite filter element device, includes: the device comprises a front filter element device for coarsely filtering water, a rear filter element device for improving water quality and taste, an RO (reverse osmosis) membrane filter element device for finely filtering the water, a first filter bottle 1 provided with the front filter element device and the rear filter element device, a second filter bottle provided with the RO membrane filter element device and a control device for controlling water path circulation, wherein the front filter element device is arranged at the upper part of the first filter bottle 1, the bottom of the front filter element device is provided with a central tube 5 communicated with a channel of the front filter element device, the lower part of the central tube 5 is provided with a front water outlet 14, and the rear filter element device is sleeved on the peripheral part of the central tube 5 and is not communicated with the front filter element device;

a first cavity communicated with the front filter element device and a second cavity communicated with the rear filter element device are arranged in the first filter bottle 1, and a first water inlet communicated with the first cavity, a first water outlet communicated with the front water outlet 14, a second water inlet communicated with the second cavity and a second water outlet are arranged at the bottom of the first filter bottle; the second filter flask is provided with an RO membrane water inlet and an RO membrane water outlet; the first water inlet, the first water outlet, the second water inlet, the second water outlet, the RO membrane water inlet and the RO membrane water outlet are all connected with the control device.

It should be noted that, because the rear filter element device is not communicated with the front filter element device, the first chamber communicated with the front filter element device and the second chamber communicated with the rear filter element device are also not communicated with each other. When the control device only controls the first water inlet and the first water outlet to be opened, untreated water flows through the first water inlet, the first chamber, the pre-filter element device, the internal channel of the pre-filter element device, the central tube, the pre-water outlet 14 and the first water outlet in sequence to finish the primary filtering and discharging operation of the water flow. And when the control device only controls the second water inlet and the second water outlet to be opened, the water flow after fine filtration sequentially flows through the second water inlet, the second chamber, the rear filter element device and the second water outlet so as to finish the water quality improvement and discharge operation of the water flow.

The structure, material, size, shape and the like of the preposed filter element device, the postposition filter element device, the RO membrane filter element device, the first filter flask 1, the second filter flask, the first chamber, the second chamber and the control device can be determined according to actual conditions and actual requirements in the actual application process.

Moreover, because the filter element of the device adopts an inverted mode, water needs to enter the first cavity from bottom to top and then is subjected to coarse filtration through the preposed filter element device, and in the process that the water enters the first cavity, the water is synchronously discharged along with the gas with the same volume, because the gas density is less than the water density, the gas can stay at the upper half part of the first filter bottle 1, the preposed water outlet 14 is positioned at the lower half part of the first filter bottle 1, when the water pressure of the water entering the first cavity is balanced with the pressure of the compressed gas, the height of the water entering the first cavity can not be increased, the water flows into the preposed filter element device from the outside of the preposed filter element device and flows into the internal channel and the central pipe 5, only when the water level reaches the height of the preposed water outlet 14, the coarse filtration water can flow out of the preposed water outlet 14, so that the height of the water flow is greatly increased, thereby improving the effective filtering area of the preposed filter element device.

In addition, this device is two filter cores with many filter core designs, because the function and the uniqueness of RO filter core, the RO filter core generally needs three routes water course to be connected, and the value of RO filter core is higher. In the in-service use process, need earlier through leading filter core device preliminary treatment water quality, can effectively prolong the life of RO membrane like this, at the in-process of renew cartridge, change leading filter core 3 earlier generally, change the RO filter core again, and the RO filter core life-span is 2 times leading filter core 3 generally, therefore, keep independent design with the RO filter core, make up leading filter core 3 and rearmounted filter core 8, set up the life that both can effectively guarantee each part and reduce cost of maintenance like this, also can reduce device spatial structure by a great extent.

Preferably, the preposed filter element device comprises a preposed filter element 3, a preposed filter element lower end cover 2 which is abutted against the top of the first filter bottle 1 and is used for fixing the top of the preposed filter element 3, a framework 4 which is arranged at the center of the preposed filter element 3 in a penetrating way and is internally provided with a channel, a preposed filter element upper end cover 6 which is used for fixing the bottom of the preposed filter element 3 and a central tube 5 which is communicated with the bottom of the framework 4, a first water inlet is communicated with a first cavity, the first cavity is communicated with the side part of the preposed filter element 3, and a preposed water outlet 14 is communicated with a first.

The front filter element 3 may be provided around the outer periphery of the frame 4 so as to improve the water filtration effect and the filtration area. The control device can control the first water inlet to be opened so that water flows into the first cavity, enters the interior through the side part of the front filter element 3 and then flows out through the framework 4 and the central pipe 5.

The structure, size, shape and material of the preposed filter element 3, the preposed filter element lower end cover 2, the framework 4, the preposed filter element upper end cover 6 and the central tube 5 can be determined according to actual conditions and actual requirements in the actual application process.

On the basis of the above embodiment, preferably, the post-filter device includes: the filter comprises a rear filter element 8 sleeved on the periphery of a central tube 5, a rear filter element lower end cover 7 which is abutted against the bottom of a front filter element upper end cover 6 and is used for fixing the top of the rear filter element 8, a rear filter element inner sleeve 9 sleeved on the periphery of the rear filter element 8, a rear filter element upper end cover 10 used for fixing the bottom of the rear filter element 8 and a rear filter element outer sleeve 11 sleeved on the periphery of the rear filter element inner sleeve 9;

a second cavity is arranged between the rear filter element inner sleeve 9 and the rear filter element outer sleeve 11, a second water inlet is communicated with the rear filter element inner sleeve 9, and a second water outlet is communicated with the rear filter element outer sleeve 11.

Preferably, the front filter element upper end cover 6 is connected with the rear filter element outer sleeve 11 through spin welding, so that waterway separation of the front filter element device and the rear filter element device is realized.

In this embodiment, the control device can control the second water inlet to be opened, so that the water after being finely filtered by the RO membrane filter device flows into the post-filter inner sleeve 9, the finely filtered water passes through the post-filter 8, then flows into the post-filter outer sleeve 11 through the second chamber, and finally flows out through the second water outlet.

In the actual application process, the structure, the size, the shape and the material of the rear filter element 8, the rear filter element lower end cover 7, the rear filter element inner sleeve 9, the rear filter element upper end cover 10 and the rear filter element outer sleeve 11 can be determined according to the actual situation and the actual requirement.

Preferably, the front filter element 3 comprises folded PP and sintered activated carbon, and a non-woven fabric for preventing black water or carbon residue generated in the using process from falling is wound on the outer periphery of the framework 4.

The folded PP filter element is formed by folding an ultrafine polypropylene fiber membrane and an inner supporting layer and an outer supporting layer of non-woven fabric (or silk screen). The sintered active carbon filter element is prepared by mixing an active carbon powder material and a high-molecular hot-melting pore-forming material, pouring the mixture into a special mould, and sintering at the high temperature of 200-300 ℃. It integrates the functions of adsorption, filtration, interception and catalysis, can effectively remove organic matter, residual chlorine and other radioactive substances in water, and has the functions of decolouring and removing peculiar smell.

However, because the filter element volume size of the device is limited, the sintered activated carbon of the front filter element 3 can generate the phenomenon that black water or carbon slag falls in the using process, so that the performance of components at the rear end of the whole system is affected, therefore, the non-woven fabric with the thickness of 1mm is wound on the periphery of the framework 4, the black water or the carbon slag generated in the using process can be effectively prevented from falling, and the influence on water flux can not be caused.

On the basis of the above embodiment, it is preferable that the rear filter element 8 includes compressed activated carbon and a nanofiber FACT filter element for sterilization.

It should be noted that the compressed activated carbon filter element is a non-woven fabric with a layer of filtering effect wrapped on the surface and the inside, so that the carbon core can not fall off carbon powder, and soft butadiene-acrylonitrile rubber sealing gaskets are generally arranged at two ends of the carbon core to ensure that the carbon core has better sealing performance when being installed in the filter cylinder. The post-positioned filter element 8 is made of compressed activated carbon, so that the contact time of water and the activated carbon can be greatly prolonged, the compressed activated carbon has the advantages of high filtering precision, abundant filtering, good outlet water taste, environmental protection and the like, and the material of the compressed activated carbon can be regenerated and reused, so that the environment cannot be polluted after the compressed activated carbon is discarded.

In addition, it should be noted that the conventional post-filter element 8 generally only includes post-activated carbon, and although the post-activated carbon can improve the taste and adsorb organic substances, when the adsorption of the post-activated carbon is saturated, the adsorbed organic substances form a hotbed for breeding bacteria, which can lead to the final exceeding of the water consumption bacteria at the tail end. The nanofiber FACT filter core adopted by the device is a microporous extruded carbon block, the average flow path of the carbon block is 1 micron or less, and the average flow path is enough to intercept cryptosporidium oocytes, viruses and bacteria, so that the aim of sterilizing after improving the taste can be fulfilled, and the problem that water-using bacteria at the tail end exceed the standard in the prior art can be effectively solved.

On the basis of the above embodiment, preferably, the bottom of the first filter flask 1 is provided with a filter flask cover 12, the filter flask cover 12 is provided with a first water inlet, a first water outlet, a second water inlet and a second water outlet, each water inlet is correspondingly provided with a one-way valve 13, and the control device is connected with the one-way valves 13 to control the opening and closing of the one-way valves 13.

Therefore, the control device can timely control the opening and closing of the one-way valve 13 according to actual conditions and actual requirements, and therefore the switching of the water channel is achieved.

The structure, material, shape, size, position and the like of the filter flask cover 12, the water inlet, the first water outlet, the second water inlet, the second water outlet and the check valve 13 can be determined in the actual application process according to the actual situation and the actual requirement.

Preferably, the connection of the internal parts of the front filter element device and the rear filter element device and the connection between the front filter element device and the rear filter element device are both in sealing connection by a sealing ring.

The sealing rings are arranged at the joints of the internal parts and the joints of the front filter element device and the rear filter element device, so that an untreated water source can be separated from water after coarse filtration; the water after coarse filtration can also flow out through the preposed water outlet 14 of the central tube 5 and then enters the RO membrane filter element device; the water after RO filtration can also be treated by a post-filter element device.

Preferably, the O-shaped sealing ring can be selected for sealing, and the shape, size, position, number and the like of the sealing ring can be determined according to actual conditions and actual requirements in the actual application process.

In addition, it should be further explained that, when the composite filter element device provided by the present invention is assembled, firstly, the front filter element lower end cover 2, the front filter element 3, the framework 4, the central tube 5 and the front filter element upper end cover 6 can be assembled and combined to form the assembly of the front filter element 3; then, the bottom of the post-filter element inner sleeve 9 is combined with the post-filter element upper end cover 10, the post-filter element 8 is placed in the post-filter element inner sleeve 9, and the post-filter element lower end cover 7 is connected with the top of the post-filter element 8; then, the central tube 5 is inserted into the rear filter element 8, and the rear filter element outer sleeve 11 is sleeved outside the rear filter element inner sleeve 9, so that the assembly of the front filter element 3 and the rear filter element 8 is completed; then, the filter bottle cap 12 is installed at the bottom of the post-filter element outer sleeve 11, finally, the assembled front filter element 3 and the post-filter element 8 are assembled into a whole and are installed in the first filter bottle 1, and then the check valve 13 is installed at each water port on the filter bottle cap 12. The device has the advantages of simple structure, convenient installation and convenient operation, and can be popularized and used.

It should be noted that, in this document, the first filter bottle 1 and the second filter bottle, the first chamber and the second chamber, the first water inlet and the second water inlet, and the first water outlet and the second water outlet are mentioned, where the first and the second are only for distinguishing the difference of the positions, and are not sequentially distinguished.

In addition, it should be noted that the directions or positional relationships indicated by "upper", "lower", "top", "bottom", and the like in the present application are based on the directions or positional relationships shown in the drawings, and are only for the convenience of simplifying the description and facilitating the understanding, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed in a specific direction, and operate, and thus, should not be construed as limiting the present invention.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The utility model provides an arbitrary compound mode of all embodiments all is in this utility model's a protection scope, does not do here and gives unnecessary details.

It is right above that the utility model provides a composite filter element device has carried out detailed introduction. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. A composite filter element arrangement, comprising: the filter comprises a front filter element device for coarsely filtering water, a rear filter element device for improving water quality and taste, an RO (reverse osmosis) membrane filter element device for finely filtering the water, a first filter bottle (1) for installing the front filter element device and the rear filter element device, a second filter bottle for installing the RO membrane filter element device and a control device for controlling water path circulation, wherein the front filter element device is arranged at the upper part of the first filter bottle (1), a central tube (5) communicated with a channel of the front filter element device is arranged at the bottom of the front filter element device, a front water outlet (14) is arranged at the lower part of the central tube (5), and the rear filter element device is sleeved at the peripheral part of the central tube (5) and is not communicated with the front filter element device;

a first cavity communicated with the front filter element device and a second cavity communicated with the rear filter element device are arranged in the first filter bottle (1), a first water inlet communicated with the first cavity, a first water outlet communicated with the front water outlet (14), a second water inlet communicated with the second cavity and a second water outlet are arranged at the bottom of the first filter bottle (1); the second filter flask is provided with an RO membrane water inlet and an RO membrane water outlet; the first water inlet, the first water outlet, the second water inlet, the second water outlet, the RO membrane water inlet and the RO membrane water outlet are all connected with the control device.

2. The composite filter element device according to claim 1, wherein the front filter element device comprises a front filter element (3), a front filter element lower end cover (2) which is abutted against the top of the first filter flask (1) and is used for fixing the top of the front filter element (3), a framework (4) which is arranged in the center of the front filter element (3) in a penetrating manner and is internally provided with the channel, a front filter element upper end cover (6) which is used for fixing the bottom of the front filter element (3), and the central tube (5) which is used for being communicated with the bottom of the framework (4), wherein the first water inlet is communicated with the first chamber, the first chamber is communicated with the side of the front filter element (3), and the front water outlet (14) is communicated with the first water outlet.

3. The composite filter element arrangement of claim 2, wherein the post-filter element arrangement comprises: the filter comprises a rear filter element (8) sleeved on the periphery of the central tube (5), a rear filter element lower end cover (7) which is abutted against the bottom of the front filter element upper end cover (6) and is used for fixing the top of the rear filter element (8), a rear filter element inner sleeve (9) sleeved on the periphery of the rear filter element (8), a rear filter element upper end cover (10) used for fixing the bottom of the rear filter element (8) and a rear filter element outer sleeve (11) sleeved on the periphery of the rear filter element inner sleeve (9);

the second cavity is arranged between the rear filter element inner sleeve (9) and the rear filter element outer sleeve (11), the second water inlet is communicated with the rear filter element inner sleeve (9), and the second water outlet is communicated with the rear filter element outer sleeve (11).

4. The composite filter element device according to claim 3, wherein the front filter element upper end cover (6) and the rear filter element outer sleeve (11) are connected by spin welding to realize water path separation of the front filter element device and the rear filter element device.

5. The composite filter element device according to claim 4, wherein the front filter element (3) comprises folded PP and sintered activated carbon, and non-woven fabric for preventing black water or carbon residue generated in the using process from falling is wound on the outer periphery of the framework (4).

6. Composite cartridge device according to claim 5, characterized in that the post-cartridge (8) comprises compressed activated carbon and nano-fibre FACT cartridge for sterilization.

7. The composite filter element device according to any one of claims 1 to 6, wherein a filter bottle cap (12) is arranged at the bottom of the first filter bottle (1), the first water inlet, the first water outlet, the second water inlet and the second water outlet are arranged on the filter bottle cap (12), a check valve (13) is correspondingly arranged on each water inlet, and the control device is connected with the check valve (13) to control the check valve (13) to open and close.

8. The composite filter element assembly of any one of claims 1 to 6, wherein the connections of the internal components of the front filter element assembly and the rear filter element assembly and the connections therebetween are sealed connections with a sealing ring.